package cn.tedu.sp06.fb;

import cn.tedu.sp01.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {
    /*
    * 设置对那个服务应用对应当前降级类
    * 只对商品降级 -item-service
    * 所有服务都应用当前降级类: * null
    *
    * */
    @Override
    public String getRoute() {
        return "item-service";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        /*
        * 对http协议进行设置
        *
        *
        * */

        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }
            /*
            * 原始状态码
            * 取出封装的文本
            * */
            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {
                //用来关闭下面方法的InputStream
                //ByteArrary...不占用系统资源,无需关闭

            }

            @Override
            public InputStream getBody() throws IOException {
                //以Json格式返回客户端
                String json =  JsonResult.build().code(500).msg("调用后台服务").toString();

                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
               HttpHeaders h = new HttpHeaders();
               //告知客户端,返回的信息提示
               h.add("Content-Type", "application/json;charset=UTF-8");
               return h;
            }
        };
    }
}
